Space syntax and time distance based analysis on the influences of the subways to the pubic traffic accessibility in Nanchang city

Based on the database of public transportation network in Nanchang, this paper evaluates the accessibility of urban public transportation by using space syntax and time distance methods. Through the calculation of the space syntax index, accessibility index and the time cost of each node, the results show that the accessibility of road intensive area and urban centers is higher than other regions, the convenience of subway line is better than bus lines, and the influence of a road along the subway is more significant than that of other regions. The control value of the whole public transit network remains stable, the time cost of urban traffic has been significantly improved with the completion of the metro line 2, the average saving travel time is about 4min, and the transit time between public transportation sites is also reduced with the constructions of subway lines. The evaluations of the pubic traffic accessibility in Nanchang city have the consistent conclusions according to space syntax and time distance methods.